Dr Deverell is the author of Gondwana Theology (Morning Star Press, 2018) and The Bonds of Freedom (Paternoster, 2008). He is a graduate of the University of Tasmania, Melbourne College of Divinity, and Monash University (where he completed doctoral studies in 2004). He has held the Sanderson Fellowship and a lectureship in liturgy and preaching at the Uniting Church Theological College as well as the Turner Fellowship at Trinity College Theological School, both within the University of Divinity. He is an active contributor to the collaboration between Whitley College, the University of Divinity, and NAIITS to deliver a curriculum in Indigenous Theology for Australia. He is a faculty member of NAIITS, an international learning community for the development and teaching of Indigenous theologies and a longtime member and contributor to the Australian Academy of Liturgy.

Garry is an international expert in sacramental studies, especially insofar as sacraments intersect with theories concerning the formation of human selves in community. His more recent research has turned towards theologising the experience of Indigenous peoples in and around the Christian churches.

Garry has delivered courses in liturgy and preaching at Trinity College Theological School and the Uniting Church Theological College. He has also contributed to courses in ecclesiology and history at Whitley College and Monash University.

Garry has contributed articles to Baptist, Anglican and Uniting Church denominational papers, as well as to Cross Purposes and Zadoc Perspectives.

Garry is a priest of the Anglican Diocese of Melbourne and member of the National Aboriginal and Torres Strait Islander Anglican Council.